is it really that difficult?
surely all that happens is that instead of just turning two off at the same time.......one simply turns just the low side fet off..........the current then goes through the diode of the opposite side high side fet.......so it comes on with ZVS....then one simply turns off the due-to-go-ff high side fet, and hay presto the current turns on the low side fets diode, , you then simply turn that fet on and it comes on with zvs.
thats remarkably simple, so howcome we believe people cant grasp it?